The Spectrum of Indium Oxide

A rather complex spectrum of InO lying between the two In resonance lines at 4102A and 4511A is described. Most of the band heads are assigned to a ²Π→²Σ system with the frequencies of the main (R₂+Q₂?) heads given by the formula ${ν}=23,595.10+626.66({v}^{{'}}+1/2){-}3.40{({v}^{{'}}+1/2)}²{-}703.09({v}^{{'}{'}}+1/2)+3.71{({v}^{{'}{'}}+1/2)}²+0.285{({v}^{{'}{'}}+1/2)}³$. ${{ν}}ₑ$ for the other spin component is at 23,033.10. The large cubic term causes rapid convergence of the few band sequences giving rise to prominent "tail" bands.